HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 547
HD6433044
Manufacturer Part Number
HD6433044
Description
(HD64 Series) Hitachi Single-Chip Microcomputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6433044.pdf
(867 pages)
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15.4.3 Input Sampling and A/D Conversion Time
The A/D converter has a built-in sample-and-hold circuit. The A/D converter samples the analog
input at a time t
conversion timing. Table 15-4 indicates the A/D conversion time.
As indicated in figure 15-5, the A/D conversion time includes t
length of t
time therefore varies within the ranges indicated in table 15-4.
In scan mode, the values given in table 15-4 apply to the first conversion. In the second and
subsequent conversions the conversion time is fixed at 256 states when CKS = 0 or 128 states
when CKS = 1.
ø
Address bus
Write signal
Input sampling
timing
ADF
Legend
(1):
(2):
t :
t
t
D
SPL
CONV
D
:
varies depending on the timing of the write access to ADCSR. The total conversion
:
ADCSR write cycle
ADCSR address
Synchronization delay
Input sampling time
A/D conversion time
D
after the ADST bit is set to 1, then starts conversion. Figure 15-5 shows the A/D
(1)
(2)
t
D
Figure 15-5 A/D Conversion Timing
t
SPL
537
t
CONV
D
and the input sampling time. The
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